DOI: 10.1161/CIRCEP.113.000930 1 Electrophysiologic Profile and Results of Invasive Risk Stratification in Asymptomatic Children and Adolescents with the Wolff-Parkinson-Wh ite Electrocardiograp hic Pattern Running title:Kubuš et al.; Risk stratification in children with WPW pattern Peter Kubuš, MD 1 ; Pavel Vít, MD 2 ; Roman A. Gebauer, MD 3 ; 1 ; Jan Janoušek, MD, PhD 1 1 Children’s Heart Center, University Hospital Motol, Prague; 2 Pediatric Cardiology, Children’s University Hospital Brno, Brno, Czech Republic; 3 Department of Pediatric Cardiology, University of Leipzig, Heart Center, Leipzig, Germany Correspondence : Peter Kubuš, MD Fakultní nemocnice v Motole V Úvalu 84, 150 06, Prague Czech Republic Tel: 00420 22443 2901 Fax: 00420 22443 2914 E-mail:[email protected]Journal Subject Code: [106] Electrophysiology s eart C t r, U iveri s ital ot l, rg e diatric C rd o , Ch l rsity osp tal Br o, Br o, Czech R u ; De artment of Pediatri Cardiolog r p rt t p , Copyright by American Heart Association, Inc. All rights reserved.
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8/10/2019 Asymptomatic WPW in Children and Adolescents
Background - Data on the results and clinical impact of an invasive risk stratification strategy inasymptomatic young patients with the Wolff-Parkinson-White (WPW) electrocardiographic pattern are scarce. Methods and Results - 85 consecutive patients aged <18 years with a WPW pattern and persistent preexcitation at maximum exercise undergoing invasive risk stratification wereretrospectively studied. Adverse accessory pathway (AP) properties were defined according tocurrently consented criteria as any of the following: shortest preexcited RR interval (SPERRI)during atri
-entrant tachycardia.Age at evaluation was median 14.9 years. 82 patients had a structurally normal heart and 3 had
hypertrophic cardiomyopathy. A single manifest AP was present in 80, one manifest and 1concealed AP in 4 and two manifest APs in 1 patient. Adverse AP properties were present in32/85 patients (37.6 %) at baseline and in additional 16/44 (36.4 %) after isoproterenol. Ablationwas performed in 41 of these 48 patients. Ablation was deferred in the remaining 7 for pathway proximity to the atrioventricular node. In addition, 18 of the low-risk patients were ablated based
on patient/parental decision.Conclusions - 37.6 % of the evaluated patients with an asymptomatic WPW preexcitation
-- t y a
nor 3
ic a o thy. A single manifest A as present n 8 ,
0 one manifest and 1
P in 4 and a A 1 pa ent. A e s
e p er s e p t
n s 37.6 ) t ba in nd tona 64 .4 ) a
ter sopr
ter ol.e n 41 t s 48 ents. A a o s de rre n t e rem n g 7 or at
o t e atr ove r cu ar no e. In a t on, o t e ow-
s t ents were ted
arenta ec s on.
8/10/2019 Asymptomatic WPW in Children and Adolescents
Although infrequently, asymptomatic patients with a Wolff-Parkinson-White (WPW)electrocardiographic pattern suffer from sudden cardiac death due to life-threatening arrhythmias
(typically atrial fibrillation with rapid antegrade conduction through an atrioventricular (AV)
accessory pathway (AP), resulting in ventricular fibrillation)0,0,0. The risk of such an event has
been reported to be approximately 0.1 % per patient-year 0. Attempts have been made to identify
patients at high risk, but specific guidelines for risk stratification in the asymptomatic young
patients with WPW, including recommendation for the invasive electrophysiologic (EP)
evaluation and prophylactic catheter ablation of the AP, have not been published until recently0.
The aim of the present study was to evaluate retrospectively the electrophysiologic profile of
asymptomatic children and adolescents with a WPW electrocardiographic pattern and to assess
the results of an invasive risk stratification strategy applying currently consented risk criteria0.
Methods
Patients
op ys o og c
pu s e u
n r e
t e n s dy was to evaluate retroe tively the elect physiologic profile
children a a esc nts a P e e tr c r gra p att r
n t as
of an asive r s s rati
a on s ategy
app y
ng urr
nt y conse e r s cr er
8/10/2019 Asymptomatic WPW in Children and Adolescents
between two groups and Kruskall-Wallis one way analysis of variance on ranks for comparison
of 3 groups. The Wilcoxon signed rank test was used to assess the effect of isoproterenolchallenge on accessory pathway properties in individual patients. Differences in proportions
between 3 groups were tested by the chi-square test followed by the Fisher´s exact test for pair-
wise comparisons. All statistical analysis was performed using the SigmaPlot for Windows
Version 11.0 (Systat Software Inc., San Jose, California, USA) and SAS Version 9.2 (SAS
Institute Inc. 100 SAS Campus Drive Cary, NC 27513-2414, USA).
Results
Patients
Structurally normal heart was present in 82/85 and hypertrophic cardiomyopathy in 3/85
patients. A single manifest AP was found in 80 patients, two manifest APs in 1 patient and the
combination of 1 manifest AP and 1 concealed AP in 4 patients. Additional diagnoses were AV
nodal re-entrant tachycardia in two patients (slow pathway RF ablation was performed in one)
and focal atrial tachycardia in one patient (not ablated) The proportion of asymptomatic patients
normal hea
t 8
5 pe t
ro ccar omy p
o a 5
si
if s was o d i ti
ts, t a s P a
ie t
d
n o e
s
t n e t . er
trant tac car a n two a ents s ow a wa a a on was er orme n o
8/10/2019 Asymptomatic WPW in Children and Adolescents
AP ERP. In one patient, measurement of AP properties could not be performed because of the
lack of both antegrade and retrograde conduction through the AP during the EP study.A group of 44/53 patients without adverse AP properties at baseline was subsequently subjected
to isoproterenol challenge shifting 16 of these 44 patients tested (36.4 %) into the higher risk
category if using the cut- ) patients at the cut-
(Table 1 ). Isoproterenol significantly increased the antegrade conduction capacity of the pathway
(Table 2 ).
From the total of 86 manifest APs, 10/86 (11.6 %) were located at the right free wall,
51/86 (59.3 %) were septal and the remaining 25/86 (29.1 %) were left-sided (P <0.001). There
were no significant differences in antegrade conduction parameters and in the proportion of APs
with adverse conduction parameters between the three localizations (Table 3 ).
Intermittent preexcitation was present in 7/85 patients during the pre-procedural Holter
monitoring. Antegrade AP conduction properties were not different from the remaining patients
(Table 4 ). AVRT was inducible in 2 of these 7 patients.
a e r g ree
t-si e .
0 .
ni n fe nces in antegrade condu n parameters a in the proportion o
e onduction para ete
r be ee t e thr e
ca zat o s
T e 3).
rm preexc ta on wa
presen
n pat nt ur
ng e pre-
roce ura
. Antegrade con
duct on propert es were no
t i fere t r
the rem
ai pa
8/10/2019 Asymptomatic WPW in Children and Adolescents
There were no complications related to the EP study or RF ablation.
There were no significant differences between both large centers participating in thestudy in any of the parameters evaluated.
Discussion
As shown in several studies, sudden cardiac death may be the first manifestation of the disease in patients with asymptomatic WPW preexcitation0,0,0. Infants and small children are probably at
lower risk 0. In a group of 184 asymptomatic children with a median age of 10 (range 8-12) years,
short AP ERP and multiple APs were independent predictors of life-threatening arrhythmic
event0
. Although non-invasive diagnostic methods such as 24-hour Holter monitoring andexercise stress testing are useful for basic assessment of the preexcitation, invasive testing should
be considered to define electrophysiologic properties of the AP in case of antegrade AP
conduction persistence through maximum exercise0,0-0. Persistent preexcitation during exercise
has high sensitivity and high negative predictive value for detection of patients at risk 0. On the
other hand patients with clear and abrupt loss of preexcitation during exercise testing are at low
reat i r
- -s testing a s o a ssess e t o t e p e xc t t on, v s e t ng
e t e l ct o hy o ic e i s o t in e of te ade P
pe te c t u is - . t t xer
ns t v t an ne a ve re c ve va ue ore ec on o a en s at r s . On
8/10/2019 Asymptomatic WPW in Children and Adolescents
positives and negatives. Pappone et al. could show a significant risk reduction of arrhythmic
events in a randomized study of prophylactic ablation in asymptomatic patients35 years of agewith the WPW electrocardiographic pattern0. On the other hand catheter ablation is associated
with a low but definite risk of complications0. This all has to be kept in mind when counseling
the families.
Patients with intermittent preexcitation on ECG/24-hour Holter monitoring are thought to
be at lower risk for life-threatening arrhythmias0,0. Intermittent preexcitation is presumed to be a
predictor of decreased antegrade AP conduction capacity0, however, antegrade AP conduction
may be present up to maximum exercise. Rare cases of patients with intermittent preexcitation
and cardiac arrest have been reported0. Moreover, patients with intermittent preexcitation are still
at risk for AVRT with retrograde activation of the atria via AP0. In our group, AVRT was
inducible in 2/7 patients with intermittent preexcitation. None of these seven patients exhibited
rapid antegrade AP conduction. The difference in manifest AP antegrade conduction properties
between patients with persistent and intermittent preexcitation was, however, not statistically
n egra e con
termt en preex a
a ve een reported. Moreover, a it ents with inter ttent preexcitation a
VRT with ret og a e tiva o of ea r a a .I o r gr o p, a
2 ents w n erm ent pr exc ta on. on o ese seven pat en s ex
rade con ction. e ifference n man est an egra e con uct o ope
8/10/2019 Asymptomatic WPW in Children and Adolescents
centre preference) were the main limitations of the study. In contrast to the recently published
consensus statement0
case of the absence of SPERRI measurement. Given the fact that SPERRI was significantly more
sensitive in detecting high AP conduction capacity than AP ERP, some patients fulfilling the risk
criteria might thus have been missed. The technique of isoproterenol administration varied
between the two centers providing invasive EP studies (intravenous bolus vs. continuous
infusion). Isoproterenol challenge was not performed in 9 patients without adverse AP properties
at baseline (all these patients were ablated based on patient/parental decision).
Conclusion
Applying retrospectively a currently consented risk stratification strategy0, 37.6 % of the
evaluated asymptomatic patients with the WPW electrocardiographic pattern persisting at peak
exercise exhibited adverse AP properties at baseline fulfilling either the class IIA or IIB ablation
indication. Isoproterenol challenge shifted additional 36.4 % of those tested into one these 2indication classes Safe ablation (remote from the AV node) could be performed in 85 4 % of
c s on .
t spective r t c nsen e r sk strat c t o r e y , . % o e
s ic ti ts t e le t o a o r tt si tin a
h r r es li s ab
Iso rotereno c a en e s te a ona6. 4 o ose es e n o one t ese
8/10/2019 Asymptomatic WPW in Children and Adolescents
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Table 1: Accessory pathway properties at baseline and during isoproterenol challenge